// 导出页面为PDF格式
import html2Canvas from 'html2canvas'
import JsPDF from 'jspdf'

export default {
    install(Vue) {
        Vue.prototype.getPdf = function (dome) {//绑定全局方法
            html2Canvas(document.querySelector(dome), {//指定的需要转pdf的接结点位置
                scale: 2,
                width: 660,
                height: 920,
            }).then(function (canvas) { //绘制canvas
                let contentWidth = canvas.width
                let contentHeight = canvas.height
                let pageHeight = contentWidth / 592.28 * 841.89
                let leftHeight = contentHeight
                let position = 0
                let imgWidth = 595.28
                let imgHeight = 592.28 / contentWidth * contentHeight
                let pageData = canvas.toDataURL('image/jpeg', 1.0)
                let PDF = new JsPDF('', 'pt', 'a4')
                if (leftHeight < pageHeight) {
                    PDF.addImage(pageData, 'PNG', 0, 0, imgWidth, imgHeight)
                } else {
                    while (leftHeight > 0) {
                        PDF.addImage(pageData, 'PNG', 0, position, imgWidth, imgHeight)
                        leftHeight -= pageHeight
                        position -= 841.89
                        if (leftHeight > 0) {
                            PDF.addPage()
                        }
                    }
                }
                PDF.save('合同' + '.pdf')//导出pdf名字
            })
        }
    }
}
